Assembly consisting of a rim and a bearing support
a technology of bearing support and rim, which is applied in the direction of tyre repairing, transportation and packaging, tyre beads, etc., can solve the problems of increasing the difficulty of mounting and dismounting tires, the risk of unwedging of tire beads, and the disadvantage of heavy assembly
Inactive Publication Date: 2002-09-12
MICHELIN RECH & TECH SA
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Benefits of technology
[0007] In order to make an assembly of the type in question, i.e., formed of a rim comprising a tread-support bearing surface located between first and second rim seats and of a tread-bearing support, lighter, while overcoming the aforementioned drawbacks and thus permit better fatigue resistance of the mounting rim, the invention proposes providing the rim bearing surface, which is intended to receive the tread-bearing support, with a circumferential protuberance or rib which is housed in a groove in the radially inner face of the tread-bearing support.
[0013] To avoid excessive difficulties in mounting the tread-bearing support on the rim bearing surface, it is in all cases advantageous for the axial distance between (1) the end, taken on the generatrix of the bearing surface, of the generatrix of the circumferential bearing groove closest to the second rim seat, and (2) the axial end of the tread-bearing support closest to the same second seat, to be at most equal to 0.3 times the axial width 1 of the radially inner face of the tread-bearing support.
[0016] Preferably, the maximum diameter of the protuberance of the bearing surface is at most equal to the diameter of the axially outer end of the second rim seat, with the aim of not creating difficulties in mounting the tire, which is intended to complete the assembly.
Problems solved by technology
The main difficulties encountered in the case of travelling with a flat tire or at low pressure relate to the risk of unwedging of the beads of the tire, and in particular the unwedging of the bead of the tire located on the outside of the vehicle.
The well-known proposed techniques for avoiding such unwedging, and in particular that consisting of arranging axially to the inside of the outer rim seat a protrusion or hump of low height, do not appear to give complete satisfaction and tend to increase the difficulties of mounting and dismounting the tires.
Although it represents an enormous advance over the previously known systems for travel under conditions of low or zero inflation, which may be referred to as "travel in degraded mode", and at the same time permits excellent performance during normal travel, the assembly described above has the disadvantage of being heavy.
Providing a metallic object with grooves, and more particularly a mounting rim for a tire, has several drawbacks: it is not always easy to form such grooves owing to the manufacturing process for the rim, and this is even more difficult when the groove(s) is (are) of small dimensions.
Furthermore, any groove includes the presence of a groove bottom with connecting fillets, whether circular or not, and fillets of small dimension generally entail a concentration of stresses and the possibility of cracks appearing in the fillets.
Method used
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[0018] FIG. 1 shows, viewed in meridian section, an integral rim 10, such as is disclosed in patent application EP 1098779, knowing that the rim may be formed with a disc an integral wheel or that the disc may be produced independently of the rim and joined to the rim thereafter. The rim 10 comprises two frustoconical rim seats 13' and 13" of unequal diameters, respectively D'.sub.A and D".sub.A. As used herein, the term "diameter of a frustoconical rim seat," is to be understood to mean the diameter of its largest circular end. The generatrices of the two seats 13' and 13" are inclined towards the outside, the diameters D'.sub.A and D".sub.A respectively, of their axially inner ends being greater than the diameters D'.sub.B and D".sub.B, respectively, of their axially outer ends. The two frustoconical seats 13' and 13" are extended axially towards the outside by two protrusions or humps 15' and 15", respectively, the heights of which, measured perpendicular to the axis of rotation,...
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An assembly including a deformable, inextensible tread-bearing support S, which can be slipped on to a suitable rim bearing surface (11). The bearing surface (11) extends axially towards the inside of a first rim seat (13'), which is in turn extended to the outside by a protrusion or hump (15') of low height. The first rim seat (13') is inclined towards the outside. A second rim seat (13'') having, viewed in meridian section, a generatrix, the axially inner end of which is located on a circle of diameter D''A greater than the diameter of the circle on which is located the axially inner end D'A of the first rim seat (13'). The two seats being, axially to the inside, extended by frustoconical portions (17, 14) of a height at least equal to 0.01 times the minimum diameter of the bearing surface (11), and the generatrices of which form with the axis of rotation angles alpha at least equal to 45°. The rim bearing surface (11) is provided with at least one circumferential protuberance (115) arranged in a circumferential groove (30) of the radially inner face of the tread bearing support S, such that the protuberance (115) axially comes to bear and butt up against at least one lateral wall of the groove (30).
Description
[0001] The present invention relates to an assembly including a wheel or an integral rim, for mounting a tire, and a tread support ring, which assembly is particularly useful in the case of a tire travelling at an abnormally low inflation pressure compared with the recommended pressure or even at zero inflation pressure. It also relates to the mounting rim as such, and to the tread-bearing support as such.[0002] The main difficulties encountered in the case of travelling with a flat tire or at low pressure relate to the risk of unwedging of the beads of the tire, and in particular the unwedging of the bead of the tire located on the outside of the vehicle. The well-known proposed techniques for avoiding such unwedging, and in particular that consisting of arranging axially to the inside of the outer rim seat a protrusion or hump of low height, do not appear to give complete satisfaction and tend to increase the difficulties of mounting and dismounting the tires.[0003] Patent EP 0 67...
Claims
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IPC IPC(8): B60B21/10B60B21/02B60B21/12B60C15/02B60C17/06
CPCB60B21/023B60B21/026B60B21/028B60B21/102B60B21/104B60B21/12B60C15/0236B60C17/06B60C15/0247B60C2017/068
InventorABINAL, RICHARDEMBERGER, THOMASPOMPIER, JEAN-PIERRE
OwnerMICHELIN RECH & TECH SA